double enveloping worm gearing
enveloping worm gear pair
Enveloping Worm with Straight Line Generatrix
cylindrical worm gearing
worm gearing
蜗轮传动
蜗杆传动装置
蜗杆蜗轮机构
蜗杆传动
蜗杆传动机构
plane to plane contact element
double blind double dummy
Double blind double dummy randomized controlled clinical trial
Double Chambers and Double Layers
Double chambers double layers floating bed
Double columns and double FIDs
Double frequency pulsation double vertical ring high gradient magnetic separator
double lift double cylinder jacquard
double -peak double -wavelength method
double pole double throw
double side double arc welding
double stack two-valve double outlet hydrant
double stem and double layer
double tube double swivel barrel